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Adducts of aqua complexes of Ln3+ with a di-hydroxylated symmetrical octamethyl-substituted cucurbituril: potential applications for isolation of heavier lanthanides
CrystEngComm ( IF 3.1 ) Pub Date : 2017-08-18 00:00:00 , DOI: 10.1039/c7ce01365e
Fang-Fang Shen 1, 2, 3, 4 , Kai Chen 5, 6, 7, 8, 9 , Zi-Yi Hua 5, 6, 7, 8, 9 , Yuan Wang 5, 6, 7, 8, 9 , Jing Xu 5, 6, 7, 8, 9 , Min-Dong Chen 5, 6, 7, 8, 9 , Yun-Qian Zhang 1, 2, 3, 4 , Zhu Tao 1, 2, 3, 4
Affiliation  

The interaction of a series of lanthanide cations (Ln3+) with a di-hydroxylated symmetrical octamethyl-substituted cucurbituril {(OH)2OMeQ[6]} has been investigated. Single-crystal X-ray diffraction analysis has revealed that the interaction results in the formation of adducts of (OH)2OMeQ[6] with aqua complexes of lanthanide cations ([Ln(H2O)8]3+), Ln = Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in (OH)2OMeQ[6]–Ln(NO3)3–H2O systems. However, no solid crystals were obtained from systems containing La, Ce, Pr, Nd and Sm. X-ray diffraction analysis has revealed that although the solid adducts fall into two isomorphous groups, there are no significant differences in the interactions between (OH)2OMeQ[6] and [Ln(H2O)8]3+ complexes and in the corresponding supramolecular assemblies. Thermodynamic parameters for the interaction between (OH)2OMeQ[6] and [Ln(H2O)8]3+ complexes based on isothermal titration calorimetry experiments show two periods corresponding to the above two systems, with the lighter lanthanide cations preferring to remain in solution and the heavier lanthanide cations forming crystalline solids. Energy dispersive spectroscopy (EDS) has shown that the interaction of OMeQ[6] with lanthanide cations could provide a means of isolating heavier lanthanide cations from their lighter counterparts.

中文翻译:

Ln 3+的水配合物与二羟基对称的八甲基取代的葫芦素的加合物:分离较重镧系元素的潜在应用

研究了一系列镧系阳离子(Ln 3+)与二羟基对称的八甲基取代的葫芦素{(OH)2 OMeQ [6]}的相互作用。X射线单晶衍射分析表明,该相互作用导致(OH)2 OMeQ [6]与镧系阳离子的水配合物([Ln(H 2 O)8 ] 3+),Ln = (OH)2 OMeQ [6] –Ln(NO 33 –H 2中的Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb和LuO系统。然而,没有从包含La,Ce,Pr,Nd和Sm的系统获得固体晶体。X射线衍射分析表明,尽管固体加合物分为两个同构基团,但(OH)2 OMeQ [6]和[Ln(H 2 O)8 ] 3+络合物之间的相互作用没有显着差异。相应的超分子组装体。(OH)2 OMeQ [6]与[Ln(H 2 O)8 ] 3+之间相互作用的热力学参数基于等温滴定量热法实验的配合物显示出对应于上述两个系统的两个周期,较轻的镧系元素阳离子倾向于保留在溶液中,而较重的镧系元素阳离子则形成结晶固体。能量色散光谱(EDS)表明,OMeQ [6]与镧系元素阳离子的相互作用可以提供一种从较轻的对应物中分离较重的镧系元素阳离子的方法。
更新日期:2017-09-12
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